<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>transition</title>
    <script src="../js/vue.min.js"></script>

</head>

<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/velocity/1.2.3/velocity.min.js"></script>
<div id="staggered-list-demo">
    <input v-model="query">
    <transition-group
            name="staggered-fade"
            tag="ul"
            v-bind:css="false"
            v-on:before-enter="beforeEnter"
            v-on:enter="enter"
            v-on:leave="leave"
    >
        <li
                v-for="(item, index) in computedList"
                v-bind:key="item.msg"
                v-bind:data-index="index"
        >{{ item.msg }}</li>
    </transition-group>
</div>
<script>
    new Vue({
        el: '#staggered-list-demo',
        data: {
            query: '',
            list: [
                { msg: 'Bruce Lee' },
                { msg: 'Jackie Chan' },
                { msg: 'Chuck Norris' },
                { msg: 'Jet Li' },
                { msg: 'Kung Fury' }
            ]
        },
        computed: {
            computedList: function () {
                var vm = this
                return this.list.filter(function (item) {
                    return item.msg.toLowerCase().indexOf(vm.query.toLowerCase()) !== -1
                })
            }
        },
        methods: {
            beforeEnter: function (el) {
                el.style.opacity = 0
                el.style.height = 0
            },
            enter: function (el, done) {
                var delay = el.dataset.index * 150
                setTimeout(function () {
                    Velocity(
                            el,
                            { opacity: 1, height: '1.6em' },
                            { complete: done }
                    )
                }, delay)
            },
            leave: function (el, done) {
                var delay = el.dataset.index * 150
                setTimeout(function () {
                    Velocity(
                            el,
                            { opacity: 0, height: 0 },
                            { complete: done }
                    )
                }, delay)
            }
        }
    })
</script>
</body>
</html>
